Huh, that's actually really interesting. I was going to say, "but even then you're still dealing with the speed of light", but I guess at the limit, it takes 4ms to reach 1,000 miles, which should be enough to get most anywhere in the U.S. to a Google data center. The latency dynamics here are a lot less implausible than I was suspecting at first, given peering at the local ISP level.